An injection mold facilitating cooling and demolding

Abstract

The present invention relates to an injection mold that facilitates cooling and demolding, including a first fixed plate, a second fixed plate, a fixed mold base, and a moving mold base. A molding cavity is provided in the moving mold base. A convex block is fixedly provided on the second fixed plate. An air inflation assembly a and an air inflation assembly b are provided on the moving mold base. An ejection assembly is slidably provided in the moving mold base. The ejection assembly includes a plurality of ejector pins, inclined air holes opened on the ejector pins, and straight air holes opened on the ejector pins. A switching assembly is slidably provided at the bottom of the ejector pins. A pushing assembly is also slidably provided in the ejection assembly. The air inflation assembly a is used to squeeze air into the inclined air holes to cool the product in the molding cavity. The air inflation assembly b is used to squeeze air into the straight air holes to separate the product from the ejector pins. The pushing assembly is used to switch the flow states of the inclined air holes and the straight air holes in cooperation with the switching assembly when moving towards the molding cavity under the action of the convex block, which speeds up the demolding speed of the product and improves the production efficiency of the product.

Description

Technical Field

[0001] The present invention relates to the technical field of injection molds, and more specifically to an injection mold that facilitates cooling and demolding. Background Art

[0002] An injection mold is a tool used to form products. By injecting hot molten plastic into the molding cavity from the injection port, and after molding, the finished product is obtained through cooling and demolding. However, existing products are usually cooled by natural cooling and then demolded. The cooling speed is slow, the effect is poor, and it is not easy to demold.

[0003] However, when the existing ejector pins eject the molded products, they easily eject dents at the bottom of the products, resulting in damage and depression at the bottom of the products, which affects the quality of the products. Moreover, due to the high temperature in the molding cavity, the demolding speed of the products is slow and the efficiency is low. In addition, there is also the problem that the products stick to the surface of the ejector pins, causing difficulty in taking the materials. Summary of the Invention

[0004] The purpose of the present invention is to provide an injection mold that facilitates cooling and demolding for the deficiencies of the existing technology. By compressing the air in the air cavity a into the inclined air holes and flowing out through the inclined air holes, the temperature in the molding cavity is reduced to cool the molded products. By compressing the air in the air cavity a into the straight air holes, the products are blown away from the surface of the ejector pins by the blown air flow. In this way, it has the functions of rapid demolding and reducing product damage, facilitating demolding, accelerating the demolding speed, and improving the production efficiency of the products.

[0005] The technical solution measures of the present invention are as follows:

[0006] An injection mold that facilitates cooling and demolding, including a first fixing plate, a second fixing plate, a fixed mold base, and a moving mold base. A molding cavity is provided in the moving mold base. A convex block is fixedly provided on the second fixing plate. An air inflation component a and an air inflation component b are provided on the moving mold base. An ejecting component is slidably provided in the moving mold base. The ejecting component includes a plurality of ejector pins, inclined air holes opened on the ejector pins, and straight air holes opened on the ejector pins. A switching component is slidably provided at the bottom of the ejector pins. A pushing component is also slidably provided in the ejecting component. The air inflation component a is used to squeeze air into the inclined air holes to cool the products in the molding cavity. The air inflation component b is used to squeeze air into the straight air holes to separate the products from the ejector pins. The pushing component is used to switch the flow states of the inclined air holes and the straight air holes in cooperation with the switching component when moving towards the molding cavity under the action of the convex block.

[0007] As a preference, the inflation assembly a includes an air chamber a fixedly arranged on the second fixed plate, a connecting rod a fixedly arranged on the moving die base, a piston a fixedly arranged on the connecting rod a, and an air pipe a fixedly connected to the bottom of the air chamber a, and the piston a slides in the air chamber a.

[0008] As a preference, the ejection assembly further includes a top plate, a support rod fixedly arranged on the top plate, a return spring sleeved on the support rod, and a ejector rod fixedly arranged on the top plate. The ejector pin is fixedly arranged on the top plate. A plurality of inclined air holes and straight air holes are provided. The interior of the top plate is of a hollow structure. A chute is provided in the ejector rod. The widths of the inclined air holes, the straight air holes, and the mold exhaust holes are the same, basically controlled between 3 mm and 5 mm. Therefore, during injection molding, the hot-melted plastic will not enter the inclined air holes and the straight air holes, and does not affect the exhaust effect of the inclined air holes and the straight air holes.

[0009] As a preference, the inflation assembly b includes an air chamber b fixedly arranged on the moving die base, a connecting rod b fixedly arranged on the top plate, a piston b fixedly arranged on the connecting rod b, and an air pipe b fixedly connected to the top of the air chamber b, and the piston b slides in the air chamber b.

[0010] As a preference, the switching assembly includes a switching plate slidably arranged on the inner wall of the top plate, a connecting rod fixedly arranged at one end of the switching plate, a fixed block fixedly arranged on the connecting rod, and a spring a fixedly connected between the fixed block and the inner wall of the top plate. The front end of the connecting rod is of an inclined surface structure. A plurality of through holes a and through holes b are provided on the switching plate.

[0011] As a preference, the pushing assembly includes a slider slidably arranged in the chute, a sliding rod fixedly arranged on the slider, four push rods fixedly arranged on the top of the sliding rod, and a spring b fixedly connected between the slider and the chute. The front end of the push rod is of an inclined surface structure, and the front end of the push rod is matched with the front end of the connecting rod.

[0012] As a preference, the top surface of the switching plate is in fit with the bottom surface of the ejector pin.

[0013] As a preference, the top plate is connected to the other ends of the air pipe a and the air pipe b.

[0014] As a preference, the bottom of the ejector rod is of an arc structure, and the bottom of the ejector rod is matched with the convex block.

[0015] As another preference, the bottom of the sliding rod is of an arc structure, and the bottom of the sliding rod is matched with the convex block.

[0016] The beneficial effects of the present invention are as follows:

[0017] 1. The present invention is provided with an inflation component a, an ejection component, and a switching component. When the moving die base moves downward, it drives the piston a to move into the air chamber a, compressing the air in the air chamber a into the air pipe a and flowing out from the inclined air holes through the through hole a. The airflow generated by several inclined air holes on the ejector pin is used to cool the molding cavity and the product, accelerating the demolding speed and improving the production efficiency of the product.

[0018] The present invention is also provided with an inflation component b and a pushing component. When the sliding rod moves upward, it pushes the switching plate. When the through hole b is aligned with the bottom of the straight air hole, the air in the air pipe b flows into the straight air hole through the through hole b. The airflow generated by several straight air holes on the ejector pin is used to eject the product, completing the demolding operation, which has the functions of rapid demolding and reducing product damage.

[0019] In summary, the present invention has the advantages of rapid demolding, rapid cooling, etc., and is suitable for the field of injection mold technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The following further describes the present invention with reference to the drawings:

[0021] Figure 1 An injection mold for facilitating cooling and demolding;

[0022] Figure 2 A schematic cross-sectional view of the injection mold;

[0023] Figure 3 For Figure 2 An enlarged schematic view of part A;

[0024] Figure 4 A schematic view of the state when the air in the air chamber a cools the product;

[0025] Figure 5 For Figure 4 An enlarged schematic view of part B;

[0026] Figure 6 A schematic view of the state when the air in the air chamber b separates the product from the ejector pin;

[0027] Figure 7 For Figure 6 An enlarged schematic view of part C. SPECIFIC EMBODIMENTS

[0028] The following clearly and completely describes the technical solutions in the embodiments of the present invention with reference to the drawings.

[0029] Embodiment 1

[0030] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0031] like Figures 1 to 7 As shown, an injection mold for easy cooling and demoulding includes a first fixed plate 1, a second fixed plate 11, a fixed mold seat 12 and a movable mold seat 13, a molding cavity 14 is arranged in the movable mold seat 13, a convex block 15 is fixedly arranged on the second fixed plate 11, an inflatable component a2 and an inflatable component b3 are arranged on the movable mold seat 13, an ejector component 4 is slidably arranged in the movable mold seat 13, and the ejector component 4 includes a plurality of ejector pins 41, an oblique air hole 42 opened on the ejector pin 41, and a straight air hole 43 opened on the ejector pin 41. The air hole 43 and the bottom of the ejector pin 41 are slidably provided with a switching component 5, and the ejector component 4 is also slidably provided with a pushing component 6. The inflation component a2 is used to squeeze air into the oblique air hole 42 to cool the product 7 in the molding cavity 14, and the inflation component b3 is used to squeeze air into the straight air hole 43 to separate the product 7 from the ejector pin 41. The pushing component 6 is used to switch the flow state of the oblique air hole 42 and the straight air hole 43 with the cooperation of the switching component 5 when it moves toward the molding cavity 14 under the action of the protrusion 15.

[0032] like Figure 2 As shown, the inflatable component a2 includes an air cavity a21 fixedly arranged on the second fixed plate 11, a connecting rod a22 fixedly arranged on the movable mold base 13, a piston a23 fixedly arranged on the connecting rod a22, and an air pipe a24 fixedly connected to the bottom of the air cavity a21. The piston a23 slides in the air cavity a21. When in use, first, the movable mold base 13 is driven upward by the cylinder to close the movable mold base 13 and the fixed mold base 12, and then injection molding is performed by the injection molding machine. After the injection molding is completed, the cylinder drives the movable mold base 13 to move downward. During the downward movement, the piston a23 slides into the air cavity a21, compressing the air in the air cavity a21 into the air pipe a24. At this time, the bottom of the inclined air hole 42 is aligned with the through hole a55 on the switching plate 51, and the bottom of the straight air hole 43 is staggered with the through hole b56 on the switching plate 51, so that air flows into the inclined air hole 42 through the air pipe a24 and the through hole a55 to cool the molding cavity 14, thereby reducing the temperature in the molding cavity 14. The air-cooling method makes it easier to demold the product 7 and prevents the product 7 from sticking to the molding cavity 14.

[0033] like Figure 2 and Figure 3As shown, the ejection assembly 4 further includes a top plate 44, a support rod 45 fixedly arranged on the top plate 44, a return spring sleeved on the support rod 45, and a ejector rod 46 fixedly arranged on the top plate 44. The ejector pin 41 is fixedly arranged on the top plate 44. A plurality of inclined air holes 42 and straight air holes 43 are provided. The inside of the top plate 44 is of a hollow structure. A chute 47 is provided in the ejector rod 46. During use, when the product 7 is formed, the moving die base 13 and the ejection assembly 4 move downward together. During the movement, the ejector rod 46 touches the convex block 15, and under the action of the convex block 15, the ejection assembly 4 moves towards the molding cavity 14. The air flow generated by a plurality of straight air holes 43 on the ejector pin 41 is used to eject the product 7, completing the demolding operation, which has the functions of rapid demolding and reducing damage to the product 7.

[0034] As Figure 2 shown, the inflation assembly b3 includes an air chamber b31 fixedly arranged on the moving die base 13, a connecting rod b32 fixedly arranged on the top plate 44, a piston b33 fixedly arranged on the connecting rod b32, and an air pipe b34 fixedly connected to the top of the air chamber b31. The piston b33 slides in the air chamber b34. During use, when the air chamber b31 moves with the moving die base 13, the air in the air chamber b31 is compressed. At the same time, after the switching plate 51 is moved a certain distance, the bottom of the straight air hole 43 is aligned with the through hole b56 on the switching plate 51, so that the air flows into the straight air hole 43 through the air pipe b34 and the through hole b56 and blows the product away from the surface of the ejector pin 41, solving the problem that when the original ejector pin 41 ejects the product upward, a dent will be ejected at the bottom of the product, affecting the quality of the product. In this way, the demolding speed of the product is accelerated and the ejection efficiency is improved.

[0035] As Figure 3 shown, the switching assembly 5 includes a switching plate 51 slidably arranged on the inner wall of the top plate 44, a connecting rod 54 fixedly arranged at one end of the switching plate 51, a fixing block 52 fixedly arranged on the connecting rod 54, and a spring a53 fixedly connected between the fixing block 52 and the inner wall of the top plate 44. The front end of the connecting rod 54 is of an inclined surface structure. A plurality of through holes a55 and through holes b56 are provided on the switching plate 51. During use, the initial state of the switching plate 51 is that the through hole a55 on the switching plate 51 is aligned with the bottom of the inclined air hole 42. When it is necessary to blow the product away from the surface of the ejector pin 41, the pushing assembly 6 pushes the switching plate 51 a certain distance, so that the through hole b56 on the switching plate 51 is aligned with the bottom of the straight air hole 43.

[0036] As Figure 2 and Figure 3As shown, the pushing assembly 6 includes a slider 61 slidably set in the slide groove 47, a slide rod 62 fixedly set on the slider 61, four push rods 63 fixedly set on the top of the slide rod 62, and a spring b64 fixedly connected between the slider 61 and the slide groove 47. The front end of the push rod 63 is set to an inclined structure, and the front end of the push rod 63 cooperates with the front end of the connecting rod 54. When in use, after the product 7 is formed, the movable mold base 13 and the ejection assembly 4 move downward together, and in the process of moving, the slide rod 62 first contacts the protrusion 15, so that the slide rod 62 moves upward under the action of the protrusion 15, so that the front end of the push rod 63 cooperates with the front end of the connecting rod 54, so that the switching plate 51 moves in a direction away from the center of the molding cavity 14, and the through hole b56 is aligned with the bottom of the straight air hole 43. When the slide rod 62 is free from the interference of the protrusion 15, the spring b64 is reset, so that the through hole b56 is staggered with the bottom of the straight air hole 43, and the bottom of the inclined air hole 42 is aligned with the through hole a55.

[0037] like Figure 7 As shown, the top surface of the switching plate 51 is fitted with the bottom surface of the ejector pin 41. By fitting the top surface of the switching plate 51 with the bottom surface of the ejector pin 41, the sealing between the top surface of the switching plate 51 and the bottom surface of the ejector pin 41 is improved, preventing the air in the air pipe a24 and the air pipe b34 from overflowing.

[0038] like Figure 1 As shown, the top plate 44 is connected to the other ends of the air pipe a24 and the air pipe b34.

[0039] like Figure 2 As shown, the bottom of the push rod 46 is set to an arc structure, and the bottom of the push rod 46 cooperates with the protrusion 15. By setting the bottom of the push rod 46 to an arc structure, the bottom of the push rod 46 is prevented from being worn.

[0040] like Figure 2 As described above, the bottom of the slide rod 62 is configured as an arc structure, and the bottom of the slide rod 62 matches with the protrusion 15. By configuring the bottom of the slide rod 62 as an arc structure, the bottom of the push rod 46 is prevented from being worn.

[0041] Embodiment 2

[0042] like Figure 2 As shown, the components that are the same as or corresponding to those in the first embodiment are marked with the corresponding figure marks in the first embodiment. For the sake of simplicity, only the differences from the first embodiment are described below. The difference between the second embodiment and the first embodiment is that the bottom of the top rod 46 and the bottom of the sliding rod 62 are both provided with cushions.

[0043] Here, in this embodiment, soft pads are provided at the bottoms of the ejector rod 46 and the slide rod 62 to prevent mutual wear and damage when the bottoms of the ejector rod 46 and the slide rod 62 come into contact with the bump 15. This method can extend the service lives of the ejector rod 46, the slide rod 62, and the bump 15.

[0044] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by terms such as "front and back", "left and right", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of the invention.

[0045] Certainly, in this technical solution, those skilled in the art should understand that the term "one" should be understood as "at least one" or "one or more". That is, in one embodiment, the number of an element can be one, while in other embodiments, the number of this element can be multiple. The term "one" should not be construed as a limitation on the quantity.

[0046] The above is only the preferred embodiment of the present invention in conjunction with the drawings, but the present invention is not limited to the above embodiments. It should be noted that for those skilled in the art, various deformations and improvements can be made without departing from the structure of the present invention, and these should also be regarded as the protection scope of the present invention, and none of them will affect the implementation effect and practicality of the present invention.

Claims

1. An injection mold facilitating cooling and demolding, comprising a first fixing plate (1), a second fixing plate (11), a fixed mold base (12) and a movable mold base (13). A molding cavity (14) is arranged in the movable mold base (13). A convex block (15) is fixedly arranged on the second fixing plate (11), and it is characterized in that: An inflation assembly a (2) and an inflation assembly b (3) are provided on the moving mold base (13). A ejecting assembly (4) is slidably arranged in the moving mold base (13). The ejecting assembly (4) includes a plurality of ejector pins (41), inclined air holes (42) formed in the ejector pins (41), and straight air holes (43) formed in the ejector pins (41). A switching assembly (5) is slidably arranged at the bottom of the ejector pin (41). A pushing assembly (6) is also slidably arranged in the ejecting assembly (4). The inflation assembly a (2) is used to squeeze air into the inclined air holes (42) to cool the product (7) in the molding cavity (14). The inflation assembly b (3) is used to squeeze air into the straight air holes (43) to separate the product (7) from the ejector pin (41). The pushing assembly (6) is used to switch the flow states of the inclined air holes (42) and the straight air holes (43) under the cooperation of the switching assembly (5) when moving towards the molding cavity (14) under the action of the convex block (15).

2. The injection mold for facilitating cooling and demolding according to claim 1, wherein: The inflation assembly a (2) includes an air chamber a (21) fixedly arranged on the second fixed plate (11), a connecting rod a (22) fixedly arranged on the moving mold base (13), a piston a (23) fixedly arranged on the connecting rod a (22), and an air pipe a (24) fixedly connected to the bottom of the air chamber a (21). The piston a (23) slides in the air chamber a (21).

3. The injection mold for facilitating cooling and demolding according to claim 1, wherein: The ejecting assembly (4) further includes a top plate (44), a support rod (45) fixedly arranged on the top plate (44), a return spring sleeved on the support rod (45), and a ejecting rod (46) fixedly arranged on the top plate (44). The ejector pins (41) are fixedly arranged on the top plate (44). A plurality of inclined air holes (42) and straight air holes (43) are formed. The inside of the top plate (44) is of a hollow structure. A chute (47) is formed in the ejecting rod (46).

4. The injection mold for facilitating cooling and demolding according to claim 1, wherein: The inflation assembly b (3) includes an air chamber b (31) fixedly arranged on the moving mold base (13), a connecting rod b (32) fixedly arranged on the top plate (44), a piston b (33) fixedly arranged on the connecting rod b (32), and an air pipe b (34) fixedly connected to the top of the air chamber b (31). The piston b (33) slides in the air chamber b (31).

5. The injection mold for facilitating cooling and demolding according to claim 1, wherein: The switching assembly (5) includes a switching plate (51) slidably arranged on the inner wall of the top plate (44), a connecting rod (54) fixedly arranged at one end of the switching plate (51), a fixing block (52) fixedly arranged on the connecting rod (54), and a spring a (53) fixedly connected between the fixing block (52) and the inner wall of the top plate (44). The front end of the connecting rod (54) is of an inclined surface structure. A plurality of through holes a (55) and through holes b (56) are formed in the switching plate (51).

6. The injection mold for facilitating cooling and demolding according to claim 1, characterized in that: The driving component (6) includes a slider (61) slidably arranged in a chute (47), a slide bar (62) fixedly arranged on the slider (61), four push rods (63) fixedly arranged on the top of the slide bar (62), and a spring b (64) fixedly connected between the slider (61) and the chute (47). The front end of the push rod (63) is arranged in an inclined surface structure, and the front end of the push rod (63) is matched with the front end of the connecting rod (54).

7. An injection mold facilitating cooling and demolding according to claim 5, characterized in that: The top surface of the switching plate (51) is in contact with the bottom surface of the ejector pin (41).

8. The injection mold for facilitating cooling and demolding according to claim 3, wherein: The top plate (44) is connected to the other ends of the air pipe a (24) and the air pipe b (34).

9. The injection mold for facilitating cooling and demolding according to claim 3, wherein: The bottom of the ejector rod (46) is arranged in an arc structure, and the bottom of the ejector rod (46) is matched with the convex block (15).

10. An injection mold facilitating cooling and demolding according to claim 6, characterized in that: The bottom of the slide bar (62) is arranged in an arc structure, and the bottom of the slide bar (62) is matched with the convex block (15).

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